what rpm to leave at while footbraking
08-11-2009, 04:29 PM
#2
Senior Member
MASTER BUILDER
Join Date: Feb 2004
Location: IN
Posts: 176
Most converter makers will say launch @ 800-900 less than stall speed for best results. You need to bring rpm up, but don't know how much your brakes will hold before it pushes you through the lights. When I footbraked, my converter was @ 3500, but could only leave @ 2000-2200 before it pushed.
08-11-2009, 08:38 PM
#4
Senior Member
RACING JUNKIE
Join Date: Nov 2004
Location: St. Louis, Missouri
Posts: 661
Depends on how well your brake system holds under pressure.
If you have drum brakes I doubt you will be able to stall as high as if you hard 12-14 inch front disc brakes.
Better get out on the pavement and experiment.
Let us know what you come up with.
If you have drum brakes I doubt you will be able to stall as high as if you hard 12-14 inch front disc brakes.
Better get out on the pavement and experiment.
Let us know what you come up with.
08-13-2009, 03:03 PM
#8
Senior Member
MASTER BUILDER
Join Date: Sep 2007
Location: Moore Oklahoma
Posts: 129
I've had several different race car combinations and every package was completely different on the launch RPM.
For example; my stroker big cube Camaro works best if I allow the converter to flash off the line. With this car I just load-up the drive train at about 1800 RPM and allow it to flash-up to 5200. If I try to lauch with more RPM, the 60 fts slow down. Less is more on the launch!
My tube chassis car w/ trans-brake is completely different. The more RPM I can stall it on the line, the faster it goes. I also foot-brake this car and more RPM is better. Additionally, more consistent ETs and better reaction times with the higher launch RPM with this car.
Therefore, you should TnT a lot and try many different RPM launches to determine what works best with your car.
Warren
For example; my stroker big cube Camaro works best if I allow the converter to flash off the line. With this car I just load-up the drive train at about 1800 RPM and allow it to flash-up to 5200. If I try to lauch with more RPM, the 60 fts slow down. Less is more on the launch!
My tube chassis car w/ trans-brake is completely different. The more RPM I can stall it on the line, the faster it goes. I also foot-brake this car and more RPM is better. Additionally, more consistent ETs and better reaction times with the higher launch RPM with this car.
Therefore, you should TnT a lot and try many different RPM launches to determine what works best with your car.
Warren
